Recording of key sound

Hello guys, I want to make a teaching video and I just want to record the voice of the keys, but nothing else. Is that possible? I think it is intuitive, that in a excel tutorial, the listener can here the typing process. Thanks in advance. What does System Audio mean?

system audio us the sound that comes from other sources that are playing on the PC, like sound from a video; system audio is different than audio picked by a mic; when system audio is on, you get a separate track for it

Many of us have tried this. Then we discover there's no point to it, and it actually distracts attention from the video and audio content. Many highly-produced videos accelerate the keystrokes, because there's nothing more boring than watching someone type.

Would love to hear your experience, or see an example somewhere of what you are trying to accomplish.